Café Royal Cocktail Book by W. J. Tarling (1937, p.185)

1 glassCanadian whisky — Canadian Club Whiskybase
2 dashesorange bitters — Orange Bittersbase
3 dashesBlackberry brandy — Blackberry Brandymodifier
2 dashessyrup — Syrupsweetener
  1. Mix and strain into a cocktail glass.